What can help me transition from perpetual licensing model to subscription based one?
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We have done a number of things to help our existing customers transition as smooth as possible to our new subscription-based model:

Perpetual license holders can continue versions covered by the license indefinitely at no additional cost. However, will you need to pay to switch to the new subscription-based model to use any newer versions that are not covered by the perpetual license.

We made JetBrains Account a single place to manage all purchased products, subscriptions, and services online.